Fats Waller plays and sings his best known song, while his backup band, including Al Casey on the guitar, get in a few licks, and a bevy of beauties dance in this soundie.
Soundies were short films, about three minutes in length. The were meant to be played on a machine called a Mills Panoram, a video jukebox that was typically to be found in bars, lounges, and similar venues. You put a dime in and got a performance from the ten on the machine. The movies would be changed weekly, and from 1940 through 1946, Mills and other companies produced more than two thousand soundies.
There are few songwriters/performers who compare to Waller.